Core Java Interview Questions, Answers for Freshers and Experienced asked in various Company Job Interviews

Core Java Interview Questions

Questions Answers Views Company eMail

What is the difference between delete and delete[]

Amazon,

3 1558

What is the difference between the Reader/Writer class hierarchy and the InputStream/OutputStream class hierarchy?

1135

What is the purpose of the System class?

1005

Explain about oops concepts.

Aditi Placement Service,

1126

Difference between string s= new string (); and string s = "abv";?

Cap Gemini,

1219

Explain about complier design(phases)

Aditi Placement Service,

1085

Explain about doubly linked list

Aditi Placement Service,

1035

What is compiler and what its output.

Cognizant,

1152

What is runtime locatable code?

Cognizant,

1437

What restrictions are placed on method overriding?

1187

What is an array in java?

1206

Explain how can you debug the Java code?

BirlaSoft,

1077

Explain the difference between an Interface and an Abstract class?

BirlaSoft,

1176

Explain the purpose of garbage collection in Java?

BirlaSoft,

1033

Explain what is Marker interface?

BirlaSoft,

1091

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Un-Answered Questions { Core Java }

Can we extend private class in java?

988

What are the java ide's? Explain

1060

What is generics in java interview questions?

1068

Why we use multi threading instead of multiprocessing?

1067

Differentiate between a class and an object.

1034

How do you sort in java?

990

What are the important features of Java 9 release?

1002

What does three dots mean in java?

1128

What is string and example?

1045

What do you mean by an object in java?

1133

What is ctrl m character?

1060

In the below example, how many string objects are created?

1048

Explain about serializable interface in java?

1010

Write a function to print Fibonacci series and Tribonacci series?

1184

What all access modifiers are allowed for top class ?

1189

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